Link Monitor Applet is a GNOME panel applet
displaying the round-trip time to a set of hosts in a bar graph. Features include a line graph able to display up to one week of round-trip time data, country flags and names, full ICMP
and ICMPv6 support, and HIG 2.0 compliance.

Network Management Tool makes it possible
to quickly find vital information about any of
your network devices such as serial numbers
and support contact information. A log is kept
for each device so that you can enter service
information. An automatic export feature that
will create a spreadsheet or database-ready
file is also provided. Each list is easily edited
with a Web interface.

SimMon is a cross platform monitoring tool which runs on almost any OS that supports the Java Virtual Machine 1.4+. Monitoring is done through the execution of existing monitoring scripts (Perl/VBS) or existing shell commands. Currently monitoring scripts are available for Solaris, Linux, Mac OS X, and Windows based systems. Network devices can be monitored via the integrated SNMPv1 scheduler.

elf is a command-line tool that allows a user (be it a script or
a human) to analyze the contents of an ELF object file
header. This header contains various integral values such
as the virtual entry point of the object file, the machine
architecture it was compiled for and more.

cpuburn is is a set of programs that load x86
CPUs as heavily as possible for the purposes
of system testing. FPU and ALU instructions
are coded in an endless loop in an attempt to
maximize heat production from the CPU,
putting stress on the CPU itself, the cooling
system, the motherboard (especially voltage
regulators), and power supply. The tests may
damage undercooled, overclocked, or
otherwise weak systems and cause data
loss or permanent damage to electronic
components.

The 'Monitor' application, which consists of 2
parts, a MonitorServer (Linux daemon) and a
MonitorClient (Java GUI), will enable the user to
monitor and log server process, memory, network,
and CPU information of multiple servers at a time.

SIGAR (System Information Gatherer and Reporter) is a cross-platform, cross-language library and command-line tool for accessing operating system and hardware level information in Java, Perl, and .NET.

GResolver is a graphical DNS query tool. It allows
system administrators to quickly and easily make
the most common DNS queries without constructing
lengthy dig commands. It supports all the main
resource record types, including AAAA, AXFR, MX,
and TXT, and the appropriate in-addr.arpa address
is constructed from dotted-quad IP addresses when
doing PTR queries. There are checkboxes for
controlling the most commonly used options.

Pingheiro is a connectivity monitoring system
based on the ping command. It's growing from a
simple monitor to be a full monitoring system with
statistics and alarms based on SMSs. Only the ping
monitor is currently implemented.